Year	Percent
1950	12.45099
1955	12.57029
1960	12.65831
1965	13.42553
1970	14.13301
1975	15.44502
1980	12.733
1985	11.35605
1990	10.12339
1995	9.2029
2000	8.40915
2005	9.08738
2010	8.05525
2015	7.74004
2020	6.53155
2025	5.55666
2030	5.34027
2035	5.38629
2040	5.48793
2045	5.41763
2050	5.19265
2055	4.94264
2060	4.82296
2065	4.87402
2070	4.9819
2075	5.02614
2080	4.98355
2085	4.90341
2090	4.86819
2095	4.90814
2100	4.98024